ETSI EN 319 122-2规定了CAdES数字签名。CAdES签名建立在CMS签名[i.9]的基础上，通过合并签名和未签名属性，这些属性在许多用例中满足某些共同要求（例如数字签名的长期有效性）。本文件规定了多个CAdES签名级别，以满足长期保持签名有效性的增量要求，某种级别始终满足其以下级别的所有要求。 这些CADE扩展签名比ETSI EN 319 122-1[1]中规定的CADE基线签名具有更高的可选性。CAdES数字签名的创建、增强和验证程序超出了范围，并在ETSI EN 319 102-1[i.5]中进行了规定。ETSI TR 119 100[i.4]中提供了关于创建、增强和验证CAdES数字签名（包括不同属性的使用）的指南。本文件旨在支持不同监管框架下的数字签名。 注:本文件中规定的CAdES数字签名旨在支持电子签名、高级电子签名、合格电子签名、电子印章、高级电子印章和符合法规（EU）的合格电子印章 第910/2014号[i.8]。

ETSI EN 319 122-2 specifies CAdES digital signatures. CAdES signatures are built on CMS signatures [i.9], by incorporation of signed and unsigned attributes, which fulfil certain common requirements (such as the long term validity of digital signatures, for instance) in a number of use cases.The present document specifies a number of CAdES signature levels addressing incremental requirements to maintain the validity of the signatures over the long term, in a way that a certain level always addresses all the requirements addressed at levels that are below it. These CAdES extended signatures a higher degree of optionality than the CAdES baseline signatures specified in ETSI EN 319 122-1 [1].Procedures for creation, augmentation, and validation of CAdES digital signatures are out of scope and specified in ETSI EN 319 102-1 [i.5]. Guidance on creation, augmentation and validation of CAdES digital signatures including the usage of the different properties is provided in ETSI TR 119 100 [i.4].The present document aims at supporting digital signatures in different regulatory frameworks.NOTE: Specifically but not exclusively, CAdES digital signatures specified in the present document aim at supporting electronic signatures, advanced electronic signatures, qualified electronic signatures, electronic seals, advanced electronic seals, and qualified electronic seals as per Regulation (EU) No 910/2014 [i.8].